New and useful dithiols, their preparation and compositions made from them

ABSTRACT

New dithiol compounds have formal and thioether groups and the general formula

United States Patent n91 Esclamadon et al.

NEW AND USEFUL DITHIOLS, THEIR PREPARATION AND COMPOSITIONS MADE FROM THEM lnventors: Christian Esclainadon, 64 Billere; Yves Labat, 64 Pau; Jean-Baptiste Signouret, 64 Billere, all of France Societe Anonyme dite: Societe Nationale des Petroles DAquitaine, Tour Aquitaine, France Filed: Jan. 28, 1970 Appl. No.: 6,553

Assignee:

Foreign Application Priority Data Jan. 31, 1969 France ..6902064 U.S. Cl. ..260/609 R, 106/19, 106/287 SC,

' 260/609 D Int. Cl ..C07c 149/14 Field of Search ..260/609 A, 609 D References Cited UNITED STATES PATENTS 3/1970 ..260/609 A X 9/1968 Oswald et al.... ..260/609 B 7/1970 Warner ..260/609 D 12/1959 Nummy ..260/609 A X Morris et al.

[451 Feb. 27, 1973 2,397,689 4/1946 Pavlic et al. ..260/609 A OTHER PUBLICATIONS Walker, Formaldehyde Third edition, pp. 364-366 (1962) Primary ExaminerLewis Gotts Assistant Examiner-D. R. Phillips Att0rneyMilton .1. Wayne 5 7] ABSTRACT New dithiol compounds have formal and thioether groups and the general formula These new dithiol compounds are used for the plasticization of sulphur and for the production, as new industrial products, of plastic sulphur compositions.

3 Claims, No Drawings NEW AND USEFUL DITHIOLS, THEIR PREPARATION AND COMPOSITIONS MADE FROM THEM SUMMARY OF THE lNVENTlON The present invention relates to novel dithiol compounds, to compositions prepared from them and to methods of producing the same.

It is one of the objects of the invention to provide novel and useful compounds of this kind which possess advantages over other known compounds for various purposes.

A further object is the provision of processes for producing these new compounds and also for using them to produce useful industrial compositions.

The invention provides novel dithiols having formal and thioether groups and, in particular, it provides such compounds which have the general formula in which R is a divalent radical of from one to carbon atoms. It can be a substituted or unsubstituted, linear or branched aliphatic group, a cycloalkyl group or an aromatic group. R can also include thioether groups.

The invention is also concerned with processes for the preparation of these new compounds and with their use for the preparation of compositions of industrial value.

The dithiols of the invention provide extremely use ful industrial products. The simultaneous presence of the thiol functions, thioether groups and formal makes these compounds very reactive and they are capable of being used in a large number of fieldsrThus they, as well as the linear or cyclic polysulphides which can be obtained by their oxidation, constitute a desirable material for the plasticizing of sulphur.

The various compositions which are obtained by the reaction of the molten sulphur with either such polysulphides or with the dithiols with formal and thioether groups can be used for a large number of purposes. The relative proportions of each constituent can vary within wide limits. Thus the sulphur can have the plasticizer added to it in a very wide range of proportions; for example from 1 to 99 percent, of plasticizer may be used.

Depending on the composition, these plastic compositions can be used for different purposes. They can form excellent coatings, particularly for concrete, brickwork, asphalted surfaces or other similar materials; one particularly practical use is the provision of road-marking strips. These plastic compositions can also be used as floor coverings by direct casting, possibly with an admixture of sand and/or gravel, with The dithiols of the invention can also be used as synthesis intermediaries for the manufacture of products having a biological action. They are oil modifiers. They can be used in those cases where mercaptans are normally employed.

The process according to the invention consists in causing the reaction with diallyl formal of a dithiol of the formula HS- R-SH, R having the same meaning 10 as given above, possibly with the inclusion of one or which they form a cement. These products can also be more thioether groups.

The dithiols which are used can be selected from a wide range of products conforming to the said general formula. However, the preferred dithiols are those in which the R group has one to two carbon atoms, as well as those comprising thioether groups, that is to say, those of the formula HS(CH S),,H, in which n can be 1, 2, or 3.

One preferred form of the invention consists in causing allyl alcohol to react with trioxymethylene, and then fixing a dithiol on the diallyl formal which is obtained.

The preferred working procedure consists in dissolving the mixture of allyl alcohol and trioxymethylene in a solvent, such as benzene, and in adding a small quantity of concentrated hydrochloric acid in the form of a previously prepared solution in benzene; after this introduction, the mixture is maintained under reflux and while stirring until the reaction has ended. The two layers are separated and the pure diene is obtained by distilling off the solvent of the organic phase.

The diallyl formal is then mixed with dithiol. The reaction is continued while stirring until the reaction is completed. After distilling off the products which have not reacted, the desired product is obtained, which is a dithiol with formal and thioether groups.

The invention is illustrated by the following nonlimiting examples:

EXAMPLE 1 l50 8g of allyl alcohol (26 moles), 390g of trioxyrnethylene (13 moles), 1000 cc of benzene and 0.3 mole of hydrochloric acid in solution in benzene are mixed in a 4-liter reactor, which is equipped with a thermometer, a stirrer mechanism and a reflux condenser. Stirring under reflux takes place for 12 hours, the water of the reaction being separated as it is formed. The organic phase is washed several times with water until neutral. 1492 g of pure diallyl formal are distilled. 384 g (3 moles) of diallyl formal are mixed with 960 g (12 moles) of dithiol methane in a l-liter reactor while stirring. The stirring is maintained for 3 days at 40C. The dithiol methane excess and the diallyl formal which has not reacted are distilled. There are obtained 660 g of a mercaptanic liquid which is formed, for the major part, of a new product, which is: l ,l 3'-dimercapto-2, l 2-dithia-6 ,8 -dioxatridecane:

HS CH,S (Cl-I9 0 CH,O (CH S Cl-l SH Analysis of this product indicates the following characteristics:

Found Calculated SH 22.5 22.9 Molecular weight 295 288 The crude mercaptanic liquid, which corresponds to a mixture of dimercaptodithioether diallyl formal and more complex dithiols, as well as the linear or cyclic polysulphides obtained from these compounds, react with sulphur at 150C to give a plasticized, modified sulphur, having a vitreous transition temperature of 55C.

EXAMPLE 2 namely: 1 ,17-dimercapto-2,4,14,16-tetrathia-8,10- dioxa-heptadecane.

Analysis of this dimercaptan indicates the following characteristics:

Found Calculated SH 17.3 17.4 Molecular weight 400 380 The crude mercaptanic liquid, which corresponds to a mixture of the previous dithiol and of more complex dithiols, as well as the linear or cyclic polysulphides obtained from these compounds, react with sulphur at C to give a plasticized, modified sulphur, having a vitreous transition temperature of 39C.

We claim:

1. A dithiol having formal and thioether groups, of the general formula:

in which R is a CH group.

2. A dithiol according to claim 1, characterized in that it is 1,13-dimercapto-2,12-dithia-6,8-dioxatridecane.

3. A dithiol according to claim 1, characterized in that it is 1,l7-dimercapto-2,4,l4,l6-tetrathia-8,10- dioxaheptadecane. 

2. A dithiol according to claim 1, characterized in that it is 1,13-dimercapto-2,12-dithia-6,8-dioxatridecane.
 3. A dithiol according to claim 1, characterized in that it is 1,17-dimercapto-2,4,14,16-tetrathia-8,10-dioxaheptadecane. 